Probe of the electron correlation in sequential double ionization of helium by two-color attosecond pulses
Probe of the electron correlation in sequential double ionization of helium by two-color attosecond pulses
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DOI：
10.1103/physreva.86.063401
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发表时间：
2012-12
影响因子：
2.9
通讯作者：
Liang-You Peng;Zheng Zhang;Weichao Jiang;Gongqiu Zhang;Q. Gong
中科院分区：
文献类型：
--
作者：
Liang-You Peng;Zheng Zhang;Weichao Jiang;Gongqiu Zhang;Q. Gong
从理论上研究了双色阿秒脉冲对氦原子的顺序双电离。我们发现，对于两个脉冲之间的短时间延迟，电离光谱不能用基于含时微扰理论的独立模型来解释。通过改变时间延迟，人们可以探索电子关联在双电离中所起的作用，这一点在考察微分双电离产额时最为明显。在本方案中，我们还发现了两个电离电子之间的一种“追赶”相互作用。
We theoretically study the sequential double ionization of He by two-color attosecond pulses. We show that, for short time delays between the two pulses, the ionization spectra cannot be explained by an independent model based on the time-dependent perturbation theory. By varying the time delay, one can probe the role of the electron correlation played in the double ionization, which is mostly obvious by examining the differential double-ionization yield. In the present scheme, we also identify a kind of ``catch-up'' interaction between the two ionized electrons.